How Do I Handle Resignation When My Contract Lacks a Notice Period Clause?

Hello, I submitted my resignation letter on 18th November. There was no particular mention in the contract about the notice period for resigning from work. There was just a simple 1-page offer letter (soft copy Word file) with mentions like:

1) For whom (the company) I'll be working
2) My monthly salary
3) Fixed term period of work for 1 year (i.e., I will not be working for more than 1 year)

I joined a company through a 3rd party vendor. I receive my salary from this vendor, not the company. I need to join somewhere else on 26th November. My vendor employer is not allowing such a thing, and I'll be completing my current work in progress before 24th November. Please guide.

Freedom to Change Employer

You have full freedom to change your employer. As per the contract, you have to serve one year of service, which you have completed. If your prospective employer is not concerned about the relieving letter, there won't be any problem. You can inform your prospective employer that you are not a direct employee of the company.

Fixed Term Appointment and Resignation

It appears that your Fixed Term Appointment is up to 24th November 2020 and is not extendable beyond this date. Therefore, the appointment automatically ends on 24th November 2020. You have already submitted your resignation on 18th November 2020, indicating your decision not to continue further. Since you have not been informed of any service extension beyond 24th November, you are well within your rights to refuse any further engagement.